Answer:
Whenever
an object falls towards the earth, its velocity goes on increasing due to
gravitational force exerted by earth on the object. The rate of change of
velocity of a freely falling object towards the centre of the earth is called
the acceleration due to gravity.
It is denoted
by g. The SI unit of acceleration due to gravity is the value of 
g on the earth's surface
is taken as 9.8 . For
simplicity of calculations it is sometimes given as 10 ms - .
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